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Add near clamping

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This commit is contained in:
Miloslav Číž 2019-05-28 18:51:12 +02:00
parent bfff51d4d0
commit 240119353e
2 changed files with 34 additions and 22 deletions
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19
small3dlib.h
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@ -122,9 +122,17 @@
#endif
#ifndef S3L_COMPUTE_DEPTH
#define S3L_COMPUTE_DEPTH 0 /**< Whether to compute depth for each pixel
(fragment). Some other options may turn this
on. */
#define S3L_COMPUTE_DEPTH 0 /**< Whether to compute depth for each pixel
(fragment). Some other options may turn this
on. */
#endif
#ifndef S3L_NEAR_CLAMPING
#define S3L_NEAR_CLAMPING 0 /**< Whether to use depth clamping for the near
plane. Only works with S3L_COMPUTE_DEPTH
enabled! This may be a bit slower, but can
prevent errorneous rendering in specific cases
and is closer to traditional 3D engines. */
#endif
#ifndef S3L_PERSPECTIVE_CORRECTION
@ -1599,6 +1607,11 @@ void _S3L_drawFilledTriangle(
p->depth = S3L_getFastLerpValue(depthFLS);
S3L_stepFastLerp(depthFLS);
#endif
#if S3L_NEAR_CLAMPING
if (p->depth < S3L_NEAR)
continue;
#endif
#endif
#if S3L_Z_BUFFER

37
testSDL.c
View file

@ -19,26 +19,14 @@
#define S3L_RESOLUTION_Y 480
#define S3L_COMPUTE_DEPTH 1
#define S3L_PERSPECTIVE_CORRECTION 0
#define S3L_PERSPECTIVE_CORRECTION 1
#define S3L_NEAR_CLAMPING 1
#include "small3dlib.h"
#include "house.h"
int32_t offScreenPixels = 0;
const int16_t test_coords[] =
{
100,100, 99,101, 101,101, // 0, small triangle
190,50, 200,10, 400,80, // 1, arbitrary
40,80, 60,50, 100,30, // 2, arbitrary
350,270, 440,200, 490,220, // 3, arbitrary
150,300, 290,400, 450,400, // 4, regular
105,200, 120,200, 201,200, // 5, horizontal line
300,200, 300,250, 300,220, // 6, vertical line
496,15, 613,131, 552,203
};
const S3L_Unit ver[] = { S3L_CUBE_VERTICES };
const S3L_Index tri[] = { S3L_CUBE_TRIANGLES };
const S3L_Unit tex_coords[] = { S3L_CUBE_TEXCOORDS(16) };
@ -114,6 +102,18 @@ void drawPixel(S3L_PixelInfo *p)
const S3L_Unit *coords;
coords = tex_coords + p->triangleID * 6;
u = S3L_interpolateBarycentric(
0,
0,
15,
p->barycentric0, p->barycentric1, p->barycentric2);
v = S3L_interpolateBarycentric(
0,
15,
0,
p->barycentric0, p->barycentric1, p->barycentric2);
/*
u = S3L_interpolateBarycentric(
coords[0],
@ -127,13 +127,12 @@ void drawPixel(S3L_PixelInfo *p)
coords[5],
p->barycentric0, p->barycentric1, p->barycentric2);
*/
// uint8_t col = texturePixel(u,v);
uint8_t col = texturePixel(u,v);
uint8_t dep = (p->depth / 5000.0) * 255;
// setPixel(p->x,p->y,col * 120,20,(2 - col) * 120);
setPixel(p->x,p->y,col * 120,dep,(2 - col) * 120);
uint8_t sss = (p->depth / 5000.0) * 255 ;
setPixel(p->x,p->y,sss, (p->triangleID * 37) % 255 ,128);
//setPixel(p->x,p->y,sss, (p->triangleID * 37) % 255 ,128);
//setPixel(p->x,p->y,p->modelID * 64,p->modelID * 128,255);